Denoise AI unkown error

@yasserdxb  Can you share the exact error message ?

It would also be very helpful if you can share the logs present in folder "C:\Users\<username>\AppData\Roaming\Adobe\CameraRaw\Logs\" to analyze this issue. Please make sure to close the app if you want to retrieve the correct logs.

Could be an issue with 6 GB VRAM as opposed to 8 GB or 16 GB VRAM "for full GPU Acceleration"as stated in:

https://helpx.adobe.com/lightroom-classic/system-requirements.html

/edit/followup/

Probably not so much a VRAM issue. I can actually accomplish a DeNoise (Enhanced) on a 2015 MACBOOKPro, with just 2 GB VRAM, with source an X-T5 RAF (but not a noisy pic)

Your video driver may be very out of date - judging by the center image. Have you looked on nVidia's site for an update?